Since she deleted herself and her work from DA permanently, I present you first Sprites of Crystal, based on her appearance in Beta version of Gold/Green ever created.
Original image was of quite poor quality i.imgur.com/TPzJV9f.jpg , but she was able to do wonders with it.

They were originally made in quite old /vp/ (or back then - /tr/)  thread, where author bring up the aforementioned screenshoot. There were many tries to reconstruct this, and her was arguably the most well done.

As presented, Sprites are for Gold/Silver and Crystal.

Sprites were created by Game Freak and were composed by Madame Frog also known as Hatun, not me, based on few tries of other users to reconstruct this, amongst them the second palette.
Author of thread later used them (the second variant), with a little modification for his hack, whose status is unknown for me.

Note: There was also her artwork based on this reconstruction: i.imgur.com/Gw5HX39.png